('06-'08) So what's the go to in turbo upgrades these days? SG9 2008 - Subaru Forester Owners Forum
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post #1 of 14 (permalink) Old 04-18-2017, 08:13 PM Thread Starter
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So what's the go to in turbo upgrades these days? SG9 2008

Have an 08 sport I've been running a vf39 and supporting mods on for a couple years. Just put a built block in and now it seems like I should add something more in the turbo dept. All the threads I've read seem to have old info. What's the consensus on a fun street turbo?


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post #2 of 14 (permalink) Old 04-19-2017, 05:09 AM
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I too am in the planning stage of turbo upgrade in the fun street car category. The tuner I spoke to recommended BNR VF40-18G Turbo for a fun street car. I had never heard of BNR, but found out they are located not far from my house. I would love to hear what others know about BNR.


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post #3 of 14 (permalink) Old 04-19-2017, 06:22 AM
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I'm interested in this as well!

I have the impression that the VF48 is the go-to at the moment for take-off turbos?
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post #4 of 14 (permalink) Old 04-19-2017, 12:19 PM
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How much boost do you run? A good sized turbo can run peak boost out to redline. A 20G sized turbo can hold 18-20 psi out to 6500 rpm. To benefit from a bigger turbo than that you need to either run higher boost (E85, meth, racegas) or run higher RPM (headwork/cams,) or both.

Me, I have stock valvetrain and run 92 octane pump gas. I have a Dom1.5XTR, can hit 19 PSI and hold to redline, for about 350 whp. It is a fun turbo.
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post #5 of 14 (permalink) Old 04-20-2017, 03:41 AM
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I also went with Blouch for their 18G-XTR, with similar numbers. Go ball bearing for longevity.

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post #6 of 14 (permalink) Old 04-21-2017, 02:36 AM
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Nice numbers on the Blouch XTR's, anyone running them on a 4EAT?

BNR has an interesting website but they only list Legacy/Outback applications? Or will those fit SG XT's too?
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post #7 of 14 (permalink) Old 04-21-2017, 03:55 AM
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Quote:
Originally Posted by scubaboo View Post
Nice numbers on the Blouch XTR's, anyone running them on a 4EAT?

BNR has an interesting website but they only list Legacy/Outback applications? Or will those fit SG XT's too?
I am on 4EAT. No issues other than preferring a manual.

Not too sure on fitment question, but generally speaking the turbo will fit if it points to the right with a traditional (non flanged) outlet.

Also, you may require a spacer on the up pipe to clear secondary air injection on back of passenger head, if equipped. I've got pictures somewhere if it helps.

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post #8 of 14 (permalink) Old 04-21-2017, 05:04 AM
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im with skirby and northman. (i also have a blouch 18G, but from before the xtr ones. and 4eat...and absolutely love it!!).

on the BNR thing...thats because the main thing they do is cram bigger internals, into turbos that have that 08 wrx/09-13 fxt/and those certain leggy eras style turbo compressor housings. with an SG era XT having the normal "sti" layout turbo, imo, theres better options to be had then one of the BNR ones.

so i vote one of the blouch 18g,20g,DOM1.5 or 2.5 options. 8cm turbine housing. any of those would be great, especially with your built block. i know @skirbykat and i still have a lot of headroom left, even with our 18Gs....if we really wanted to let them sing. but i personally havent felt the need to, yet, as its fun as **** on the street as is.
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post #9 of 14 (permalink) Old 04-21-2017, 09:49 AM Thread Starter
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Is the 1.5 xtr recommended over the 2.5 for a daily driven street turbo?


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post #10 of 14 (permalink) Old 04-22-2017, 05:59 AM
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According to their website, the 1.5 looks to be ideal for 2 liter applications. It sounds like it may run out of steam in the upper end if pushed to the max HP mark. This is, of course, just from comparing the two turbos numbers - you may want further real world info.

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post #11 of 14 (permalink) Old 04-22-2017, 06:26 AM
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Originally Posted by scubaboo View Post
I'm interested in this as well!

I have the impression that the VF48 is the go-to at the moment for take-off turbos?
The 48 is one of the larger and desirable turbos from IHI, and for 08 and prior it would be a modification free install (aside from tuning).

That being said, I personally would put the same money towards a higher end product if buying new.

Now for my rant -
I've gotta say I'm not a big fan of IHI not producing replacement parts for rebuild. In general, this portrays a "sell out to the big box store" "made in China" "our stuff is trash when damaged" image. I don't like to think of a turbo as a disposable. Now, some places will rebuild, but the parts will not come from IHI.

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post #12 of 14 (permalink) Old 04-24-2017, 08:19 AM
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Is the 1.5 xtr recommended over the 2.5 for a daily driven street turbo?


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As I mentioned, the 1.5 is fully capable of pushing 19 PSI out to redline, unless you can run more boost or higher RPM there will be no real benefit from going bigger. If anything it is probably a bit more than the car needs, but it is generally preferable to have a slightly big turbo that is not maxed out, versus a slightly small turbo that you push past its envelope of efficiency. Perhaps you would gain a little from having a bigger hotside and less exhaust restriction? In my case I have a catted downpipe and a relatively quiet muffler, (Maddad Whisper) so I thing that would not help me.
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post #13 of 14 (permalink) Old 04-24-2017, 04:27 PM Thread Starter
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1.5 seems the way I'm headed. 8cm or 10cm on the 2.5? Are the coated housing or 3" inlet worth while?


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post #14 of 14 (permalink) Old 04-24-2017, 04:28 PM Thread Starter
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I also run a Carter Cobb dp and the whisper


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